/* -------------------------------------------------------------------------
 *
 * md5.h
 *	  Interface to libpq/md5.c
 *
 * These definitions are needed by both frontend and backend code to work
 * with MD5-encrypted passwords.
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/libpq/md5.h
 *
 * -------------------------------------------------------------------------
 */
#ifndef PG_MD5_H
#define PG_MD5_H

#define MD5_PASSWD_CHARSET "0123456789abcdef"
#define MD5_PASSWD_LEN 35

/*
 * md5 produces a 16 byte (128 bit) hash; double it for hex.
 */
#define MD5_HASH_LEN 32

#define isMD5(passwd)                                                          \
    ((strncmp(passwd, "md5", 3) == 0) && (strlen(passwd) == MD5_PASSWD_LEN) && \
        (strspn(passwd + 3, MD5_PASSWD_CHARSET) == MD5_PASSWD_LEN - 3))

extern bool pg_md5_hash(const void* buff, size_t len, char* hexsum);
extern bool pg_md5_binary(const void* buff, size_t len, void* outbuf);
extern bool pg_md5_encrypt(const char* passwd, const char* salt, size_t salt_len, char* buf);

#endif
